mkmik commented on pull request #1747:
URL: 
https://github.com/apache/arrow-datafusion/pull/1747#issuecomment-1031348601


   @alamb thanks; I factored out the normalization step in a utility function 
and called it from a few more places.
   
   I added tests that cover all of the column references I can think of (e.g. 
aliases, order by, where, group by). I wouldn't be surprised if I missed some, 
but perhaps we can treat such cases as new bugs.
   
   I specifically didn't cover table name reference normalization here and 
instead opened #1771 to track that.
   
   PTAL


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